fix: prevent asset conflicts between React and Grid.js versions

Add coexistence checks to all enqueue methods to prevent loading
both React and Grid.js assets simultaneously.

Changes:
- ReactAdmin.php: Only enqueue React assets when ?react=1
- Init.php: Skip Grid.js when React active on admin pages
- Form.php, Coupon.php, Access.php: Restore classic assets when ?react=0
- Customer.php, Product.php, License.php: Add coexistence checks

Now the toggle between Classic and React versions works correctly.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

node_modules/css-tree/cjs/syntax/atrule/font-face.cjs

@@ -0,0 +1,12 @@
+'use strict';
+
+const fontFace = {
+    parse: {
+        prelude: null,
+        block() {
+            return this.Block(true);
+        }
+    }
+};
+
+module.exports = fontFace;

node_modules/css-tree/cjs/syntax/atrule/import.cjs

@@ -0,0 +1,37 @@
+'use strict';
+
+const types = require('../../tokenizer/types.cjs');
+
+const importAtrule = {
+    parse: {
+        prelude() {
+            const children = this.createList();
+
+            this.skipSC();
+
+            switch (this.tokenType) {
+                case types.String:
+                    children.push(this.String());
+                    break;
+
+                case types.Url:
+                case types.Function:
+                    children.push(this.Url());
+                    break;
+
+                default:
+                    this.error('String or url() is expected');
+            }
+
+            if (this.lookupNonWSType(0) === types.Ident ||
+                this.lookupNonWSType(0) === types.LeftParenthesis) {
+                children.push(this.MediaQueryList());
+            }
+
+            return children;
+        },
+        block: null
+    }
+};
+
+module.exports = importAtrule;

node_modules/css-tree/cjs/syntax/atrule/index.cjs

@@ -0,0 +1,19 @@
+'use strict';
+
+const fontFace = require('./font-face.cjs');
+const _import = require('./import.cjs');
+const media = require('./media.cjs');
+const nest = require('./nest.cjs');
+const page = require('./page.cjs');
+const supports = require('./supports.cjs');
+
+const atrule = {
+    'font-face': fontFace,
+    'import': _import,
+    media,
+    nest,
+    page,
+    supports
+};
+
+module.exports = atrule;

node_modules/css-tree/cjs/syntax/atrule/media.cjs

@@ -0,0 +1,16 @@
+'use strict';
+
+const media = {
+    parse: {
+        prelude() {
+            return this.createSingleNodeList(
+                this.MediaQueryList()
+            );
+        },
+        block(isStyleBlock = false) {
+            return this.Block(isStyleBlock);
+        }
+    }
+};
+
+module.exports = media;

node_modules/css-tree/cjs/syntax/atrule/nest.cjs

@@ -0,0 +1,16 @@
+'use strict';
+
+const nest = {
+    parse: {
+        prelude() {
+            return this.createSingleNodeList(
+                this.SelectorList()
+            );
+        },
+        block() {
+            return this.Block(true);
+        }
+    }
+};
+
+module.exports = nest;

node_modules/css-tree/cjs/syntax/atrule/page.cjs

@@ -0,0 +1,16 @@
+'use strict';
+
+const page = {
+    parse: {
+        prelude() {
+            return this.createSingleNodeList(
+                this.SelectorList()
+            );
+        },
+        block() {
+            return this.Block(true);
+        }
+    }
+};
+
+module.exports = page;

node_modules/css-tree/cjs/syntax/atrule/supports.cjs

@@ -0,0 +1,77 @@
+'use strict';
+
+const types = require('../../tokenizer/types.cjs');
+
+function consumeRaw() {
+    return this.createSingleNodeList(
+        this.Raw(this.tokenIndex, null, false)
+    );
+}
+
+function parentheses() {
+    this.skipSC();
+
+    if (this.tokenType === types.Ident &&
+        this.lookupNonWSType(1) === types.Colon) {
+        return this.createSingleNodeList(
+            this.Declaration()
+        );
+    }
+
+    return readSequence.call(this);
+}
+
+function readSequence() {
+    const children = this.createList();
+    let child;
+
+    this.skipSC();
+
+    scan:
+    while (!this.eof) {
+        switch (this.tokenType) {
+            case types.Comment:
+            case types.WhiteSpace:
+                this.next();
+                continue;
+
+            case types.Function:
+                child = this.Function(consumeRaw, this.scope.AtrulePrelude);
+                break;
+
+            case types.Ident:
+                child = this.Identifier();
+                break;
+
+            case types.LeftParenthesis:
+                child = this.Parentheses(parentheses, this.scope.AtrulePrelude);
+                break;
+
+            default:
+                break scan;
+        }
+
+        children.push(child);
+    }
+
+    return children;
+}
+
+const supports = {
+    parse: {
+        prelude() {
+            const children = readSequence.call(this);
+
+            if (this.getFirstListNode(children) === null) {
+                this.error('Condition is expected');
+            }
+
+            return children;
+        },
+        block(isStyleBlock = false) {
+            return this.Block(isStyleBlock);
+        }
+    }
+};
+
+module.exports = supports;